<% if Rails.application.secrets.google_analytics_tracking_id.present? %>
  <%#
    google_analytics_tracking_id should be defined in config/secrets.yml
    It will be something like 'UA-12345678-1'.
    Create an account at https://www.google.com/analytics
    NB: If this page is cached, you will have to manually expire it when
    you set or change the google_analytics_tracking_id value.
  %>
  <script>

    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
    })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

    ga('create', '<%= Rails.application.secrets.google_analytics_tracking_id %>', 'auto');
    ga('send', 'pageview');

  </script>

<% end %>
